# temp = input("输入分数：");
# score = int(temp);
# print()
# def  my(socre):
#     return {
#         score>90 & score <100: 'A',
#         score>80 & score <90: 'B',
#         score>60 & score <80: 'C',
#         score>0 & score <60: 'D',
#     }.get(score,"ERROR");

h = ["a","b","c"];
h.append("ChoviWu");
h.extend(["阿里巴巴","百度","Tencent"]);
print(h);
#foreach
for i in h:
    print(i);
#delete a number
h.remove("ChoviWu");
#delete a number or all
del h[0];
print(h);
#foreach
for i in h:
    print(i);